- * All implementations should override this method.
- * The default definition of this method is used only in YANG 1.0 (RFC6020)
- * implementation of PatternStatement which does not support modifier statement.
- * YANG pattern statement has been changed in YANG 1.1 (RFC7950) and now allows modifier statement.
+ * Return a modifier statement, if present. In RFC6020 semantics, there are no modifiers and this methods always
+ * returns null.